linux-kernel - Re: [PATCH RFC LKMM 2/7] doc: Replace smp_cond_acquire() with smp_cond_load

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Date:   Fri, 14 Sep 2018 17:59:07 +0100
From:   Will Deacon <will.deacon@....com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        mingo@...nel.org, stern@...land.harvard.edu,
        parri.andrea@...il.com, peterz@...radead.org, boqun.feng@...il.com,
        npiggin@...il.com, dhowells@...hat.com, j.alglave@....ac.uk,
        luc.maranget@...ia.fr, akiyks@...il.com,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        Daniel Lustig <dlustig@...dia.com>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH RFC LKMM 2/7] doc: Replace smp_cond_acquire() with
 smp_cond_load_acquire()

On Wed, Aug 29, 2018 at 02:10:48PM -0700, Paul E. McKenney wrote:
> From: Andrea Parri <andrea.parri@...rulasolutions.com>
> 
> Amend commit 1f03e8d2919270 ("locking/barriers: Replace smp_cond_acquire()
> with smp_cond_load_acquire()") by updating the documentation accordingly.
> Also remove some obsolete information related to the implementation.
> 
> Signed-off-by: Andrea Parri <andrea.parri@...rulasolutions.com>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: David Howells <dhowells@...hat.com>
> Cc: Jade Alglave <j.alglave@....ac.uk>
> Cc: Luc Maranget <luc.maranget@...ia.fr>
> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> Cc: Akira Yokosawa <akiyks@...il.com>
> Cc: Daniel Lustig <dlustig@...dia.com>
> Cc: Jonathan Corbet <corbet@....net>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> ---
>  Documentation/memory-barriers.txt | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
> index 0d8d7ef131e9..c1d913944ad8 100644
> --- a/Documentation/memory-barriers.txt
> +++ b/Documentation/memory-barriers.txt
> @@ -471,8 +471,7 @@ And a couple of implicit varieties:
>       operations after the ACQUIRE operation will appear to happen after the
>       ACQUIRE operation with respect to the other components of the system.
>       ACQUIRE operations include LOCK operations and both smp_load_acquire()
> -     and smp_cond_acquire() operations. The later builds the necessary ACQUIRE
> -     semantics from relying on a control dependency and smp_rmb().
> +     and smp_cond_load_acquire() operations.

Thanks for fixing the doc:

Acked-by: Will Deacon <will.deacon@....com>

Will